Proteans are serpentine outsiders of pure chaos. They have the following traits.

• Blindsense (distance varies by Protean type).
• Immunity to acid.
• Resistance to electricity 10 and sonic 10.
• Constrict and grab as Special Attacks.
• Supernatural flight.
• Freedom of Movement (Su) A Protean has continuous Freedom of Movement, as per the spell.
• Amorphous Anatomy (Ex) A protean's vital organs shift and Change Shape and position constantly. This grants it a 50% chance to ignore additional Damage caused by critical hits and sneak attacks, and grants it Immunity to Polymorph effects (unless the Protean is a willing target). A Protean automatically recovers from physical blindness or deafness after 1 round by growing new sensory organs to replace those that were compromised.
• Change Shape (Su) A protean's form is not fixed. Once per day as a standard Action, a Protean may Change Shape into any Small, Medium, or Large Animal, Elemental, giant, Humanoid, Magical Beast, monstrous Humanoid, ooze, plant, or Vermin. A Protean can resume its True Form as a free Action, and when it does so, it gains the effects of a heal spell (CL equal to the protean's HD).